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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3b87c09cbc8bb9e1e8bfb4b5e3c72676b65d87867b519e2efa726db4aab39a' 
  AND token = '6TkTgh3hI885Iu8IZozhM5k5NisLLG6Giqj2ONIr5Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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