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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752926ff0f493deaae1bb18f903f3b3391988d1a048e8e401eb7856faf34f76f' 
  AND token = 'KFHyupQetLzPNCZfZIJPZtifKJymHLrL261JsCOSqsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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