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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c42786a64b11359fe6dfd819ab7675eb8def187fedc1da184f4e3896f53e6c' 
  AND token = '1luBaOqPxXLzJHrVsTv+5y4t/4UmAMuA1BSbfPO2DQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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