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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e21c83fd2cb2cdd4b6f7c102fb66a3a5a20b53831ea3ec07b5da26b32c79f1' 
  AND token = 'zNtl5qeX4YaSkSEN7qLJlAF/3jh24rzByVNmWTCjXQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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