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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b91304179409564a96aac22756d03d8a281442024589f51100972dc1fadfbe' 
  AND token = 'nl90nk8Om0aD4AwKdt9kEqsHmzEnzhWH0myY6oBeyGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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