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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f769124f80461af3b17e1d87fa1243617ccab580264f6a47571ccdc089b2ba' 
  AND token = 'QTiU+iTubS2qDYmz5x3Cb2pAsmdoYxuLM8lDsyln11c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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