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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033418de6a7407df58fcf07c55698ad1da5a0e480df575616573d04a8cd86650' 
  AND token = 'YdQG8LQDh03DjQP9/TfCPwzgo35unQyJs4mioeLrbZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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