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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c2ddfd624280c5354c73b6b2ac9813b5ed9c49ebd7dc9148b5a651e3a393fd' 
  AND token = 'NTSnqEGhgIpVUiaMkCz1Pxr2gWGqnOmQHzdqjNADQ6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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