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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3e8072d5d884d41a608e2d0cae22f4dd7800442748f84f4b13c3f8a361d753' 
  AND token = 'D3uyRSxXNHbKA0S+4e8q7MwqD+kWSbJU9TDwBqKxtCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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