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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c926a413b69289da288a4e9515567daf9f5eebf75bb79b4f9d8ea6385e861986' 
  AND token = 'tihMHZTW2kshm9oEku5JQpDftvAMDLaKt0HMz26e8yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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