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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2a57c7f3dfc6199cf91cf13e8183fa2bd960d964a964db2899a68ef97aee8d' 
  AND token = 'GSSjGh4uHld9L0LJd4NTTC5DUt9IGZRCJ/F3idfCuoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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