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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c04e4ff8992f6012f5a9e4732d66f015dda4aedb49228b02e11a92d4869068' 
  AND token = 'zrUdNLEllFHdltZpG5v/0C9o/Ox/Ue61NuKaGBwLaks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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