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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb54618c670831e42d17d9275a6672d249242174f89722622a25d08d0513c6cd' 
  AND token = 'VsPwfcMLIJ5ncufsMZB0MSw05FYWqif8Phulj2ICKRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00235

JSON explain

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