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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd210979efdbbfacf9b25a0440ac2cf2c92ef91c6d266391351b9d16826093c69' 
  AND token = 'k+/nboALWqaEeP2ERXFkGa9wY1KZDDs7dxGAmReM+4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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