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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b5c81c1c26018c6ebc76517e5697c305733614d2e324213d5477f512e61f36' 
  AND token = 'c/l8OCXF6ndhKp8f3WQRxle72d5FS1aSVaWOd+y2IxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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