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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7482a9cb641123f543b0ee39d851696513f19e98b99fab5e9995e95e450228e0' 
  AND token = 'btejD6EmUklMbVo2jGGR9ZCdd7+rW06An0BHEZxuE+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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