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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9a0cd38beb3863cd100b69cdce3ad51d459cb5ed05baa01062aabfec8cb13e' 
  AND token = 'nhoXm4yCdcbf3gz8hPa8sGdQo/BNDDZG/l9c2hfduNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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