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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dda6d92b0f335fd7ed21858b78747a6150e4d9d310fc63ba0534de95ee11cf7' 
  AND token = '8KG7qhrr9yqF0wNSDGovwzkhn91bmbeROm1ytmc+o48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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