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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19cf95c37028c2dc1c363a66d201df243a81bab393978c0aa813e4d55e6018c' 
  AND token = 'wjbdZisImvdhqSoUGstW93eLleyFybULjekZ5Qd3ddY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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