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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbc5fb451fdf84bba4513ffd1d198130068a363d1ca332fc833da262f56ab20' 
  AND token = 'AIMiA66JLg1o0D5XZofmLK9ZvTT5GWFrZWxNk0nBloo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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