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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a09d61a839f0c58b0eae7c56d1e9ce43e5ae00d71a36904ae1cad00f07b7c5' 
  AND token = 'm0onXl6hx/U7S9v1GBjVodfxdEKg/Wk0J5PgfEji8ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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