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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4f6fe4e99062ebab75d9fab439db01ac987ec33b95ba8d80115c063aa6e393' 
  AND token = 'WM/YK4cjwtX4kqp0DQlLDrKCrjhtKPWIlMsFB4stAko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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