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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d18ac9e092b08db4ec000fa1bb23b01526c0488719a6f05181ccdc8e5b1279' 
  AND token = 'LRc6UhbqNusirMa/fedzs3aEtPOIwCsjRknIQ4x2zoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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