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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bf0ba04bf3c94edec00ac79913373ea2badea60b57fe292020b8d260768972' 
  AND token = 'W3G7l6TMNaDXfTzeOoIUv5rCgRwniFQ91ziw5TSZz7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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