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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7160aa72a59eb3cdbb7c4664edaab54d23c56d61c5658e5b0bfde4b8e1efd7' 
  AND token = 'HOWcJ+TBe6DLOAILCvj8vGCZHzNGauoJds84Dwcqgfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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