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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f18f33bdfaceed13e348948a3093cd304e85d8ae80c8a4d39968627e3bd4ea' 
  AND token = 'Lt6fWHbAC842V8HXKV5h1ED3XAwPbDNXeEDh7I6kFlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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