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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5530a344c630a755096f42f94d5889c1aca57532067f17cd866e9af758d1b98b' 
  AND token = 'N7T2laAzB2f5ucQBSlfDqL7+3jTajAUh73T2DGss8Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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