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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd172b3556729d0af37eb1ef4959e557553485407e082199cd06df9bf15f68d53' 
  AND token = 'AIzOiongJRms26WKjOrS3JPQaQyM9+Tv6+tLhrDCCDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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