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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab439511bd7bcc0c0131b84e0a581adfc4669411aafb93b2ba412dc1ba9e74cc' 
  AND token = 's4Ud19GiIj6S56NAD5YoMR4/r+xUbRBTfAwC11yyheg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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