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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d69f3b36fa8b6210dbd720ab5bce9b17936c033b1b36bc55f1ae732fabcbf02' 
  AND token = '9721SMeZ1AVbsKvMxAn/7b32Y5blNN5y0louicjEDsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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