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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d19880ad40c9a3f252feda8146e80bec419967a730f8b9d6221ec99649ca91' 
  AND token = 'NG63iKme5Ncp3DZA4i5mJssx/Z40SHvvDU7qwl/8/Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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