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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd33d7b34f0458353ad1a5e651c328bc18cef6cfd5eda9e9eb1e41be350347c3' 
  AND token = 'wvi6itiT12gFyDD+ylvDXbR69iB7sAx8jufm3C1rUIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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