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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983479f5041cd254c843251a08bdd3ca5497b18d1fa1fb6ddb16b1fc82855696' 
  AND token = 'QGg95mjfB1i06XU+OZ06DhMZ16eJ70SglYEdyoBkdmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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