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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa9e34fe002db37e692feecb825bc79be9ba9d8ee4ce3f44d4f7f25a27abc21' 
  AND token = 'lOWntm5O+mCHYeOJ/Znc9Qju8QjxvJ8WM1ac3SCUpPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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