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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce384c2f40206768fa311e9f8f3bd9c8b9c33c180f727d414eead0404f2f84b' 
  AND token = 'n32F4rthoqf93qqKXvAwhkv5iYuSc8DllS4o3hlBr/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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