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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da987f03d797de90899351f806a083685e262cb998fb9d9b87b881fbb5f33725' 
  AND token = 'X/C9WWclrhuLCgyP9l8onnmlRcNRtKUHkRmhHj40gLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables