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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1953bbf3edc6612330e2f346e8144b81de4aedb459609f9e7d9fe828354b85df' 
  AND token = 'QkkfVU/QNWGTeYDRMuWrkqIa+uiA2diWjH1ZcOHMk6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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