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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af95c4b2fdbd29a98696f662dcf3780052c50f24b1c342788e9b870d81674ebe' 
  AND token = 'WvYPfw5oYlg30wAKHWk2Sz9SP3OIaux4258ZWICgUe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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