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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff48c0c264b04de2a6c9af878f045f62898350068634f8e0482899feb3934d5' 
  AND token = 'xNrLNwGfRbBLHT5t2J5GYgay41Gw0m+hKf63rlK/FOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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