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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e24fb73dcc0726e73f134dbde0201ad02b0f3b4e87fd03acbe420a8c534039f' 
  AND token = '6cz0qeeHOilAIXqc+2eTUbIu+zQYi4tzyT48MmH/YFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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