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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c188de9d1defdbcaa5afbd933ff2a7791a7a169479db4ede40bc6d669eeeb796' 
  AND token = 'VndFLPR0OQAOO1Uh0QiQjQz2L36YHWKCQ4WQGSX9UHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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