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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd09d637c1f0e1897b516ef271eaa33de7e08143673606d4fdbd147f018c926f' 
  AND token = 'f7j6HEB4EQhl0XZXwmJJWgcHCCq/Mmh7BPiCJNaYS1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}