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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62624057bf3fc83ffa82b4368ca4a255268d3cf6de940988918e51f8f29a1faf' 
  AND token = 'K8UqpPCAMYLYESFMMkatfikqkmb+7FCyCUMEjq5nMn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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