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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca37b37d13ffd3dae87f21ca7751862bba55f8bcea30f20b680e53b79c633d7' 
  AND token = 'DcfwolOw3QycJ724l20P55hKUM1Mo4MRpRYa0CmqTzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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