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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd097c21e8d97518175fbe4b89ce85e71efb241d55e47bed1e2530ec510c47584' 
  AND token = 'XbFMLrQaBJXgBgDqTyoB/pl+JV7+5qhf1kYYE6LGMDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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