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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe8ee33b5ce39a11aa2f3000db74583ee5dd08323890fa7bfd1abce7f7a91bb' 
  AND token = 'ktRFzxXRxLhxXaAPyOm6mjT4FLElEZWZ2CEhQ15Rk2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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