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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf17d10cf76925b6a34d7374221f73307a5e215a3ba11bda364dd2045cf729b' 
  AND token = '4bks7uJ8KQI7TFx2UbvnbGAw+T1EU/pSQK4kUHL48kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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