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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef50551798a2a4ecb565b4cb2f848a6d88684894dfe0b8b93789c7c46e40d60' 
  AND token = '6JQ/2/JTPXyijA620JFgTC3dGMT0TpDci8AALeAEl2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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