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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ad6a2611e445aa11e316b7412828142d38fe4a9a627802cebb900cb38c2759' 
  AND token = 'Y6oDw5jWJZKOZG348y7jh7DS1VEw0OxVxIO9Gf8HIuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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