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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c4837e417e544173bbd59a9503bf0fb6ee82487812dc80500443eb9404cf92' 
  AND token = 'x5zNcBDaq3xopoaej2Dt88MtZcl8Dcj2UkiRmcoxxDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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