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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329e46a20398517b63de1e791956098226af8a103ba6d0b09ac7eb14f72a4b45' 
  AND token = 'MYF5agrLgl5+nGtQjP9e0TShGRZc5NZQPDSOLxdMUuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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