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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16c2aebb0bac42088f73b461c646b94a6ef35d0b3fd4c5c24a95b023434b1a4' 
  AND token = 'xq7TqzDrWqP35n2eelllZoFMQuqhCbyssb2JcjDR64I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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